Permissions API is not returning for Onedrive Sharing a file to user

Question

Use case

1. If we share a file to user1(edit) , and hit permissions API, will return user1 details
2. if we share same file to user 2(edit), hit permissions API , will return user2 not user 1?

Use case 2:

1. If we use delta call for user Files, all files will come, capture deltaToken
2. share one file to user1(edit)
3. Hit delta URL -> that file changes detected.
4. share same file to user2(edit)
5. Hit delta, this file changes are not visible and we call permissions API separately for this file, only user2 is coming other than owner.

User Case 3:

1. repeat same activity as use case 2 with folder, it will not reflect the users in permissions.