Asus AC68U and hide FTP folder

[Marmota]

Hello all,

I have configured the FTP server and created an user. To this particular user I have given R/W access to a single folder, while the rest are having the No flag set.
Unfortunately, when the user login, all the folders are seen, even there is no access to them.

Can this be achieved in any way in the standard firmware or via merlin fw?

Thanks