code: func (n *Mounter) GetMountRefs(pathname string) ([]string, error) {
  	pathExists, pathErr := mount.PathExists(pathname)
  	if !pathExists || mount.IsCorruptedMnt(pathErr) {
  		return []string{}, nil
  	} else if pathErr != nil {
  		return nil, fmt.Errorf("Error checking path %s: %v", pathname, pathErr)
  	}
  	hostpath, err := n.ne.EvalSymlinks(pathname, true /* mustExist */)
  	if err != nil {
  		return nil, err
  	}
  	return mount.SearchMountPoints(hostpath, hostProcMountinfoPath)
  }
docs: // GetMountRefs finds all mount references to the path, returns a
  // list of paths. Path could be a mountpoint path, device or a normal
  // directory (for bind mount).