code: func MoveToFolderRelativeHostSystemID(client *govmomi.Client, ds *object.Datastore, hsID, relative string) error {
  	hs, err := hostsystem.FromID(client, hsID)
  	if err != nil {
  		return err
  	}
  	f, err := folder.DatastoreFolderFromObject(client, hs, relative)
  	if err != nil {
  		return err
  	}
  	return folder.MoveObjectTo(ds.Reference(), f)
  }
docs: // MoveToFolderRelativeHostSystemID is a complex method that moves a
  // datastore to a given datastore path, similar to MoveToFolder,
  // except the path is relative to a HostSystem supplied by ID instead of the
  // datastore.