From child theme remove class which is added by parent theme?

So the parent theme adds masonry in the body class by

function water_lily_body_class( $classes ) {
    if ( !is_singular() && !is_404() && !is_author()  ) 
        $classes[] = 'masonry';
    return $classes;
}
add_filter('body_class','water_lily_body_class');

Now in my child theme i don't like to have the masonry class for category blog, so in the parent functions.php i just add the

&& !is_category('8')

But i like to have a function in my child theme's functions.php which removes the body class masonry something like

function remove_masonry_body_class( $classes ) {
    if ( is_category('8')  ) 
        //$classes[] -= 'masonry';//remove masonry???
    return $classes;
}
add_filter('body_class','remove_masonry_lily_body_class');

Any idea how to strip the masonry class??