func TestVfsCreateBase(t *testing.T) { graphtest.DriverTestCreateBase(t, "vfs") }
func TestOverlayCreateBase(t *testing.T) { graphtest.DriverTestCreateBase(t, "overlay") }
func TestDevmapperCreateBase(t *testing.T) { graphtest.DriverTestCreateBase(t, "devicemapper") }
func TestBtrfsCreateBase(t *testing.T) { graphtest.DriverTestCreateBase(t, "btrfs") }