code: func (bk *Backend) DeleteBucket(parent []string, bucket string) error {
  	fullBucket := append(parent, bucket)
  
  	err := os.Remove(bk.flatten(fullBucket))
  	if err != nil {
  		return trace.ConvertSystemError(err)
  	}
  
  	return nil
  }
docs: // DeleteBucket deletes the bucket by a given path.