chart.js如何使x轴标签位于顶部

<canvas id="myChart"></canvas>

var ctx = document.getElementById('myChart').getContext('2d');

var chart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ['标签1', '标签2', '标签3'],
        datasets: [{
            label: '数据集',
            data: [10, 20, 30]
        }]
    },
    options: {
        scales: {
            x: {
                position: 'top',
                ticks: {
                    display: false
                }
            },
            y: {
                beginAtZero: true
            }
        }
    }
});