code: func hostDatastoreSystemFromHostSystemID(client *govmomi.Client, hsID string) (*object.HostDatastoreSystem, error) {
  	hs, err := hostsystem.FromID(client, hsID)
  	if err != nil {
  		return nil, err
  	}
  	ctx, cancel := context.WithTimeout(context.Background(), defaultAPITimeout)
  	defer cancel()
  	return hs.ConfigManager().DatastoreSystem(ctx)
  }
docs: // hostDatastoreSystemFromHostSystemID locates a HostDatastoreSystem from a
  // specified HostSystem managed object ID.