func TestBtrfsCreateSnap(t *testing.T) { graphtest.DriverTestCreateSnap(t, "btrfs") }
func TestDevmapperCreateSnap(t *testing.T) { graphtest.DriverTestCreateSnap(t, "devicemapper") }
func TestVfsCreateSnap(t *testing.T) { graphtest.DriverTestCreateSnap(t, "vfs") }