code: func (i ImageManifest) Blobs() []digest.Digest {
  	digests := []digest.Digest{}
  	for _, descriptor := range i.SchemaV2Manifest.References() {
  		digests = append(digests, descriptor.Digest)
  	}
  	return digests
  }
docs: // Blobs returns the digests for all the blobs referenced by this manifest