Support mount opts for `local` volume driver

Allows users to submit options similar to the `mount` command when
creating a volume with the `local` volume driver.

For example:

```go
$ docker volume create -d local --opt type=nfs --opt device=myNfsServer:/data --opt o=noatime,nosuid
```

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

docs/reference/commandline/volume_create.md

@@ -21,10 +21,12 @@ parent = "smn_cli"
 
 Creates a new volume that containers can consume and store data in. If a name is not specified, Docker generates a random name. You create a volume and then configure the container to use it, for example:
 
-    $ docker volume create --name hello
+```bash
-    hello
+$ docker volume create --name hello
+hello
 
-    $ docker run -d -v hello:/world busybox ls /world
+$ docker run -d -v hello:/world busybox ls /world
+```
 
 The mount is created inside the container's `/world` directory. Docker does not support relative paths for mount points inside the container.
 
@@ -42,12 +44,28 @@ If you specify a volume name already in use on the current driver, Docker assume
 
 Some volume drivers may take options to customize the volume creation. Use the `-o` or `--opt` flags to pass driver options:
 
-    $ docker volume create --driver fake --opt tardis=blue --opt timey=wimey
+```bash
+$ docker volume create --driver fake --opt tardis=blue --opt timey=wimey
+```
 
 These options are passed directly to the volume driver. Options for
 different volume drivers may do different things (or nothing at all).
 
-*Note*: The built-in `local` volume driver does not currently accept any options.
+The built-in `local` driver on Windows does not support any options.
+
+The built-in `local` driver on Linux accepts options similar to the linux `mount`
+command:
+
+```bash
+$ docker volume create --driver local --opt type=tmpfs --opt device=tmpfs --opt o=size=100m,uid=1000
+```
+
+Another example:
+
+```bash
+$ docker volume create --driver local --opt type=btrfs --opt device=/dev/sda2
+```
+
 
 ## Related information
 

man/docker-volume-create.1.md

@@ -15,11 +15,9 @@ docker-volume-create - Create a new volume
 
 Creates a new volume that containers can consume and store data in. If a name is not specified, Docker generates a random name. You create a volume and then configure the container to use it, for example:
 
-  ```
+    $ docker volume create --name hello
-  $ docker volume create --name hello
+    hello
-  hello
+    $ docker run -d -v hello:/world busybox ls /world
-  $ docker run -d -v hello:/world busybox ls /world
-  ```
 
 The mount is created inside the container's `/src` directory. Docker doesn't not support relative paths for mount points inside the container. 
 
@@ -29,14 +27,22 @@ Multiple containers can use the same volume in the same time period. This is use
 
 Some volume drivers may take options to customize the volume creation. Use the `-o` or `--opt` flags to pass driver options:
 
-  ```
+    $ docker volume create --driver fake --opt tardis=blue --opt timey=wimey
-  $ docker volume create --driver fake --opt tardis=blue --opt timey=wimey
-  ```
 
 These options are passed directly to the volume driver. Options for
 different volume drivers may do different things (or nothing at all).
 
-*Note*: The built-in `local` volume driver does not currently accept any options.
+The built-in `local` driver on Windows does not support any options.
+
+The built-in `local` driver on Linux accepts options similar to the linux `mount`
+command:
+
+    $ docker volume create --driver local --opt type=tmpfs --opt device=tmpfs --opt o=size=100m,uid=1000
+
+Another example:
+
+    $ docker volume create --driver local --opt type=btrfs --opt device=/dev/sda2
+
 
 # OPTIONS
 **-d**, **--driver**="*local*"