code: func ParentsFilter(path string) FilterFunc {
  	return func(m *Info) (bool, bool) {
  		skip := !strings.HasPrefix(path, m.Mountpoint)
  		return skip, false
  	}
  }
docs: // ParentsFilter returns all entries whose mount points
  // can be parents of a path specified, discarding others.
  // For example, given `/var/lib/docker/something`, entries
  // like `/var/lib/docker`, `/var` and `/` are returned.