hook_menu() parent stub

To make a Drupal 7 / YAD7 menu placeholder that generates a page automatically populating it with the sub-menu items, make the following entry in a hook_menu function
function example_menu() {
  return [
    'example' => [
      'title' => 'Example placeholder',
      'description' => 'This will automatically populate with the sub-menu items',
      'weight' => -2,
      'page callback' => 'system_admin_menu_block_page',
      'access arguments' => [ 'access administration pages' ],
      'file' => 'system.admin.inc',
      'file path' => drupal_get_path('module', 'system') ] ];
}