devmapper.Mounted: remove

It looks like no one uses this function.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

daemon/graphdriver/devmapper/mount.go

@@ -6,30 +6,8 @@ import (
 	"bytes"
 	"fmt"
 	"os"
-	"path/filepath"
-
-	"golang.org/x/sys/unix"
 )
 
-// FIXME: this is copy-pasted from the aufs driver.
-// It should be moved into the core.
-
-// Mounted returns true if a mount point exists.
-func Mounted(mountpoint string) (bool, error) {
-	var mntpointSt unix.Stat_t
-	if err := unix.Stat(mountpoint, &mntpointSt); err != nil {
-		if os.IsNotExist(err) {
-			return false, nil
-		}
-		return false, err
-	}
-	var parentSt unix.Stat_t
-	if err := unix.Stat(filepath.Join(mountpoint, ".."), &parentSt); err != nil {
-		return false, err
-	}
-	return mntpointSt.Dev != parentSt.Dev, nil
-}
-
 type probeData struct {
 	fsName string
 	magic  string