I have always thought, because of the mastery description, that more points on parry increases the stun duration also. But after a long discussion in my ally a friend did some tests and proved the opposite.
Is parry bugged or it's just the description that is wrong?
https://youtu.be/Igmohs_DSY0
PS. My game is in Italian so I haven't posted the mastery description for this reason. If someone wants to post it here I will be grateful.