code: func (v Vacuum) RemoveBlob(dgst string) error {
  	d, err := digest.Parse(dgst)
  	if err != nil {
  		return err
  	}
  
  	blobPath, err := pathFor(blobPathSpec{digest: d})
  	if err != nil {
  		return err
  	}
  
  	dcontext.GetLogger(v.ctx).Infof("Deleting blob: %s", blobPath)
  
  	err = v.driver.Delete(v.ctx, blobPath)
  	if err != nil {
  		return err
  	}
  
  	return nil
  }
docs: // RemoveBlob removes a blob from the filesystem