hide admin toolbar for subscribers

function custom_disable_admin_bar( $show_admin_bar ) {
    if ( ! ( current_user_can( 'edit_posts' ) ) ) {
        $show_admin_bar = false;
    }

    return $show_admin_bar;
}
add_filter( 'show_admin_bar', 'custom_disable_admin_bar', 99, 1 );