code: func (s *Server) Open() error {
  	opts := stand.GetDefaultOptions()
  	opts.StoreType = stores.TypeFile
  	opts.ID = ServerName
  	opts.FilestoreDir = s.config.FilestoreDir
  	server, err := stand.RunServerWithOpts(opts, nil)
  	if err != nil {
  		return err
  	}
  
  	s.Server = server
  
  	return nil
  }
docs: // Open starts a NATS streaming server