// NFS server and kubelet may not be able to do lstat/stat() there.
	forceUnmounter, ok := c.mounter.(mount.MounterForceUnmounter)
	if ok {
		klog.V(4).Infof("Using force unmounter interface")
		return mount.CleanupMountWithForce(dir, forceUnmounter, true /* extensiveMountPointCheck */, unMountTimeout)
	}
	return mount.CleanupMountPoint(dir, c.mounter, true /* extensiveMountPointCheck */)
}