How to specify Views page as parent for menu link?
Views generates menu link id's with a prefix views_view: and the first page display normally has the id page_1, so the parent should be something like this:

  parent: views_view:views.branch_locations.page_1


There is no error thrown, if parent: doesn't match an existing menu link. It's ignored and the menu link appears in the top level of the menu. 

It doesn't matter from which provider the menu links are from, all discovered menu links are treated equally in the menu tree table.