code: func (ff FilesystemView) NewSymlinkedView(source, linkname string) FilesystemView {
  	prefix := source
  	if ff.sourcePrefix != "" {
  		prefix = filepath.Join(ff.sourcePrefix, source)
  	}
  	return FilesystemView{root: linkname, blacklist: ff.blacklist, sourcePrefix: prefix}
  }
docs: // NewSymlinkedView returns a filesystem view from a symlinked directory within itself.