code: func (s *fs) Delete(dgst digest.Digest) error {
  	s.Lock()
  	defer s.Unlock()
  
  	if err := os.RemoveAll(s.metadataDir(dgst)); err != nil {
  		return err
  	}
  	return os.Remove(s.contentFile(dgst))
  }
docs: // Delete removes content and metadata files associated with the digest.