Mute Group Track via script

Im looking for a way to mute a Track Group via script , so far what i was able to do is to loop through each tracks and mute them, how do i mute the parent Track Group by it name.

using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Timeline;
public class timeLineMuteUnMute : MonoBehaviour
{
    public PlayableDirector director;
    public TimelineAsset timelineAsset;
    // Start is called before the first frame update
    void Start()
    {
        MuteTracksInGroup("MY-GROUP");
    }
    void MuteTracksInGroup(string groupName)
        {
        director.playableAsset = timelineAsset; // Ensure director uses the TimelineAsset

        // Loop through all tracks in the TimelineAsset
        foreach (var track in timelineAsset.GetOutputTracks())
        {
            track.muted = false;
        }

        director.RebuildGraph(); // Rebuild the playable graph to reflect changes
        }
           

}