The scenario is: for a given folder, multiple groups have been assigned to gain access. For example, group 1 and group 2 are assigned on folder f1.
My understanding is all users in group1 or group have access to the documents in f1.
But, my requirement is only those users who exist both in group 1 AND group 2 can access the folder.
Building a 3rd group which contains users existing both in group1 and group 2 can solve the problem, but that may cause the composition explosion problem if number of groups are huge.