code: func MoveToFolder(client *govmomi.Client, ds *object.Datastore, relative string) error {
  	f, err := folder.DatastoreFolderFromObject(client, ds, relative)
  	if err != nil {
  		return err
  	}
  	return folder.MoveObjectTo(ds.Reference(), f)
  }
docs: // MoveToFolder is a complex method that moves a datastore to a given
  // relative datastore folder path. "Relative" here means relative to a
  // datacenter, which is discovered from the current datastore path.