If I have document library with folders inside, and share folder1 to firstname.lastname@example.org, folder2 to email@example.com (send link to e-mails).
As I see, user1 cannot see folder2 and vice-versa, so they see only their shared folders. But how SP does it? It saves token in browser or what..
Can I be sure that user2 will never see folder1, if he does not have link?
This is how different users see different data. Folder names are guid's in my case: