Highcharts - 隐藏导航器范围线

Highcharts - Hide Navigator Range Lines

如何隐藏导航器中的水平线和垂直范围线,如图所示?

gridLineWidth设为0:

    navigator: {
        xAxis: {
            gridLineWidth: 0
        }
    }

现场演示: http://jsfiddle.net/BlackLabel/jth4vy9c/

API参考:https://api.highcharts.com/highstock/navigator.xAxis.gridLineWidth