code: func isremount(device string, flags uintptr) bool {
  	switch {
  	// We treat device "" and "none" as a remount request to provide compatibility with
  	// requests that don't explicitly set MS_REMOUNT such as those manipulating bind mounts.
  	case flags&unix.MS_REMOUNT != 0, device == "", device == "none":
  		return true
  	default:
  		return false
  	}
  }
docs: // isremount returns true if either device name or flags identify a remount request, false otherwise.