Wordpress functon to ensure new pages are added as a child to a top level Menu item titled “Pages”

Hi, I want a add_filter or add_action wordpress function to ensure that all new pages are added as a child to a top level Menu item titled “Pages” The function first needs to check whether the user has the “Auto add pages” [x] Automatically add new top level pages to this menu” checked in Appearance>Menus If they have then the new pages gets added This is for the primary menu of a wordpress site You can do it at as plugin or just give me the code to paste into [login to view URL] Must be for latest wordpress 4