如何在highcharts中限制dataLabels？

plotOptions: {
    series: {
        dataLabels: {
            enabled: false
        }
    }
}

plotOptions: {
    series: {
        dataLabels: {
            formatter: function() {
                // 根据条件判断是否显示dataLabels
                if (this.y > 100) {
                    return this.y;
                } else {
                    return null;
                }
            }
        }
    }
}

plotOptions: {
    series: {
        dataLabels: {
            style: {
                fontSize: '12px',
                color: '#000000'
            }
        }
    }
}

plotOptions: {
    series: {
        dataLabels: {
            overflow: 'justify'
        }
    }
}