如何在ZF3中继承嵌套字段集的getInputFilterSpecification方法

use Zend\InputFilter\InputFilter;

class MyInputFilter extends InputFilter
{
    public function getInputFilterSpecification()
    {
        $spec = parent::getInputFilterSpecification();

        // 添加嵌套字段集的字段规范
        $spec['nested_fieldset'] = [
            'required' => true,
            'validators' => [
                // 添加验证器
            ],
            'filters' => [
                // 添加过滤器
            ],
        ];

        return $spec;
    }
}