Wrapping Primary and Secondary Navigation in custom divs in Genesis

functions.php

//* Wrap .nav-primary in a custom div
add_filter( 'genesis_do_nav', 'genesis_child_nav', 10, 3 );
function genesis_child_nav($nav_output, $nav, $args) {

	return '<div class="nav-primary-wrapper">' . $nav_output . '</div>';

}

//* Wrap .nav-secondary in a custom div
add_filter( 'genesis_do_subnav', 'genesis_child_subnav', 10, 3 );
function genesis_child_subnav($subnav_output, $subnav, $args) {
	return sprintf( '<nav %s>', genesis_attr( 'nav-secondary' ) ) . $menu . '</nav>';
}