Golang SSH session ANSI Escape Codes

I'm creating an scp-tui but I can't get terminal colors to work, I need them because I have to differenciate folders from files. When I call the command ls it returns only the string with the list of the files without colors. How can I get it working?

    session, err := sshClient.NewSession()
    handleError(err)
    defer session.Close()

    // Set up terminal modes
    modes := ssh.TerminalModes{
        ssh.ECHO:          0, // disable echoing
        ssh.ECHOCTL:       0,
        ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
        ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
    }

    err = session.RequestPty("xterm", 80, 40, modes)

    handleError(err)

    var output []byte
    output, err = session.Output("ls")

    fmt.Printf("output: %v\n", output)
    return string(output), err

P.S. Are there better ways to get a list of files and folders of the current directory?

Update: I temporarely resolved the issue by executing two distinct commands to get first the files and then the directories.