Can't remount with new options in /etc/fstab

I have a partition /dev/sdb8 with ext4 filesystem on it.

At first I mounted it with usrquota,grpquota options in /etc/fstab

/dev/sdb8  /quota    ext4  usrquota,grpquota   0  0 

mount /quota 

mount # I can see it is mounted correctly

Then I tried to remount it but only with "defaults" option in /etc/fstab :

/dev/sdb8  /quota   ext4    defaults  0 0 


mount -o remount /quota
mount # Not what I expected

But after last mount command I still can see usrquota,grpquota options.

Any ideas why is it like that ?