How to create a page that only multisite-admins can edit?

I am working on a plugin that creates a page with wp_insert_post – now I want to make sure that only users who are multisite-admins are able to edit this page. Is there an easy way to make sure of that? I have been looking at current_user_can and the WP_Roles class but couldn’t find a way to take just one page away from all roles except the multisite-admin one.