List File level collaboration v/s Folder level collaboration API response

Hi,

We have issue where we want to get all the collaborators for file, however, we are not getting all the collaborators. If I call list folder collaboration Api, I am getting all the collaborators whoever have access to that file. If it is waterfall permission model, I should have all the collaborations from the file endpoint, if that file under the parent folder.

So why I am not getting all the collaborators when I use list file collaboration API?

ref: - List file collaborations - API Reference - Box Developer Documentation