code: func (o *FileSystemSaver) Save(store uuid.Store) {
  
  	if store.Timestamp >= o.Timestamp {
  		err := o.openAndDo(o.encode, &store)
  		if err == nil {
  			if o.Report {
  				o.Println("file system saver saved", store)
  			}
  		}
  		o.Timestamp = store.Add(o.Duration)
  	}
  }
docs: // Save saves the given store to the filesystem.