When I try to get all the files in the directory, the list of files I get is empty

[Aliuyanfeng]

Describe the bug
I use the Walk method to get the file traversal, but can not get the file in the directory, but there are files in the directory

To Reproduce

	file, err := os.Open(indexTableName)
	if err != nil {
		log.Println(fmt.Sprintf("open file failed, %s;", err))
	}
	oldFileAbsPath := make(map[string]struct{})
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := scanner.Text()
		oldFileAbsPath[line] = struct{}{}
	}
	_ = file.Close()

	err = conn.Conn.ChangeDir(remoteFolderPath)
	if err != nil {
		oldFileAbsPath = nil
		return nil, errors.New(fmt.Sprintf("path failed:%s,:%s", remoteFolderPath, err))
	}

	fileAbsPath := make(map[string]string)
	pathsSplit := strings.Split(remoteFolderPath, "/")
	walker := conn.Conn.Walk(remoteFolderPath)
	var builder strings.Builder
	for walker.Next() {
		info := walker.Stat()
		if info.Type.String() == "folder" {
			continue
		}
		if info == nil {
			continue
		}
		v := walker.Path()

		vSplit := strings.Split(path.Dir(v), "/")
	
		if len(vSplit)-1 > (len(pathsSplit)-1+folderLevel) && folderLevel > 0 && folderLevel != 0 {
			continue
		}

		builder.WriteString(v)
		builder.WriteRune('-')
		builder.WriteString(strconv.FormatUint(info.Size, 10))
		builder.WriteRune('-')
		builder.WriteString(info.Time.Format("20060102150405"))
		m5 := builder.String()
		//m5 := v + "-" + strconv.FormatUint(info.Size, 10) + "-" + info.Time.Format("20060102150405")
		if _, ok := oldFileAbsPath[m5]; !ok {
		
			fileAbsPath[v] = m5
		}
		builder.Reset()

	}
	if err = walker.Err(); err != nil {
		log.Println(fmt.Sprintf("path failed:%s,:%s", remoteFolderPath, err))
	}
	oldFileAbsPath = nil

FTP server

• Name and version: vsftpd 3.0.2

Additional context
Is it related to the file system string?

Looking forward to reply! 🤣