Meta Slider - Flex Slider - Copy Attributes to Anchor from Img

function metaslider_add_title_and_alt_and_rel_to_anchor($attributes, $slide, $slider_id) {
    $attributes['rel'] = 'lightbox';
    $attributes['title'] = $slide['title'];
    $attributes['alt'] = $slide['alt'];

    return $attributes;
}
add_filter('metaslider_flex_slider_anchor_attributes', 'metaslider_add_title_and_alt_and_rel_to_anchor', 10, 3);