code: func (p *Pod) Sync() error {
  	cfd, err := p.Fd()
  	if err != nil {
  		return errwrap.Wrap(fmt.Errorf("error acquiring pod %v dir fd", p.UUID.String()), err)
  	}
  	if err := sys.Syncfs(cfd); err != nil {
  		return errwrap.Wrap(fmt.Errorf("failed to sync pod %v data", p.UUID.String()), err)
  	}
  	return nil
  }
docs: // Sync syncs the pod data. By now it calls a syncfs on the filesystem
  // containing the pod's directory.