code: func ValidateMountpoints(wmp map[string]types.MountPoint) results {
  	r := results{}
  	// TODO(jonboulle): verify actual source
  	for _, mp := range wmp {
  		if err := checkMount(mp.Path, mp.ReadOnly); err != nil {
  			r = append(r, err)
  		}
  	}
  	return r
  }
docs: // ValidateMountpoints ensures that the given mount points are present in the
  // environment in which this process is running