code: func IsMember(pod *object.StoragePod, ds *object.Datastore) (bool, error) {
  	dprops, err := datastore.Properties(ds)
  	if err != nil {
  		return false, fmt.Errorf("error getting properties for datastore %q: %s", ds.Name(), err)
  	}
  	if dprops.Parent == nil {
  		return false, nil
  	}
  	if *dprops.Parent != pod.Reference() {
  		return false, nil
  	}
  	return true, nil
  }
docs: // IsMember checks to see if a datastore is a member of the datastore cluster
  // in question.
  //
  // This is a pretty basic operation that checks that the parent of the
  // datastore is the StoragePod.