dovecot´s multiple quota roots

[Andreas Kasenides]

I am trying to find out how Dovecot behaves when there are multiple 
quota roots.
I could not find something authoritative on this.
For example, on a nicely running server that used fs quota I now have in 
90-quota.conf

plugin {
  quota = fs:Mail Quota:user:mount=/Mail
  quota2 = maildir:Mail User Quota
}

When I do
> doveadm quota get -u atrige01
Quota name      Type    Value  Limit                                    
                        %
Mail Quota      STORAGE 80036 204800                                    
                       39
Mail User Quota STORAGE 79306      -                                    
                        0
Mail User Quota MESSAGE   304      -                                    
                        0

Apparently both STORAGE quotas values are the same. The question is 
which of the two
is being used by Dovecot. If I insert a limit on the maildir quota which 
of the two will be used?
I am using Dovecot 2.2.12.

thank you