Xfce4 mount permissions

[ReDirEct__]

Hi all, i'm trying to share folders trough th thunar-shares-plugin but, when i'm logged in as a normal user, the share tab in the file properties says "you are not the owner of the folder" (the folder it's owned by root). The folder i'm trying to share it's an usb disk, not mounted at startup and mounted by double click it's icon on the xfce4 desktop. My question is: how do i mount the usb disk setting the the current logged in user as owner of the disk mount point?

Some other infos:
Mounts goes under /run/media/{user} ... directory owned by user.
I'm using systemd + pam + polkit + udev + udisks2 (really i don't know how and if all these works well together, and which one handle the ownership assignment during mount... maybe udisks or udev?)

Sorry for noobish... but i'm really lost in all documentation... so every explaination it's well accepted .

Thanks