code: func Find(dir string) *FindFilter {
  	return &FindFilter{
  		dir:       dir,
  		ifmode:    func(os.FileMode) bool { return true },
  		skipdirif: func(d string) bool { return false },
  	}
  }
docs: // Find returns a filter that produces matching nodes under a
  // filesystem directory. The items yielded by the filter will be
  // prefixed by dir. E.g., if dir contains subdir/file, the filter
  // will yield dir/subdir/file. By default, the filter matches all types
  // of files (regular files, directories, symbolic links, etc.).
  // This behavior can be adjusted by calling FindFilter methods
  // before executing the filter.