code: func GetMountRefs(mounter Interface, mountPath string) ([]string, error) {
  	mps, err := mounter.List()
  	if err != nil {
  		return nil, err
  	}
  
  	// Find the device name.
  	deviceName := ""
  	for i := range mps {
  		if mps[i].Path == mountPath {
  			deviceName = mps[i].Device
  			break
  		}
  	}
  
  	// Find all references to the device.
  	var refs []string
  	if deviceName == "" {
  		glog.Warningf("could not determine device for path: %q", mountPath)
  	} else {
  		for i := range mps {
  			if mps[i].Device == deviceName && mps[i].Path != mountPath {
  				refs = append(refs, mps[i].Path)
  			}
  		}
  	}
  	return refs, nil
  }
docs: // GetMountRefs finds all other references to the device referenced
  // by mountPath; returns a list of paths.