func IsSymlink(fi os.FileInfo) bool
IsSymlink is used to determine if the fileinfo is a symbolic link.
func Walk(root string, walkFn filepath.WalkFunc) error
Walk walks the file tree rooted at root, calling walkFn for each file or directory in the tree, including root. All errors that arise visiting files and directories are filtered by walkFn. The files are walked in lexical order, which makes the output deterministic but means that for very large directories Walk can be inefficient. Walk follows symbolic links.