Actually, no, because it is sitting on a line all by itself then it doesn’t make sense that it’s not working. So I’m a little confused.
Try this
add_filter( 'acf/load_field/name=funbotic_parents', 'funbotic_load_parents' );
function funbotic_load_parents( $field ) {
$field['readonly'] = 1;
echo '<pre>'; print_r($field); echo '</pre>';
return $field;
}
when you load the edit page where the field would appear that should output all of the field settings for the field above the field.