Need Router for network usb drive with PW protected folders

I am trying to add a USB drive to a simple network as a network shared drive. From what Ive read some have very basic user configurability and just share the whole volume, and others will actually allow you to configure access to shared permission by folder instead of the whole volume. Can anyone recommend a good router to do this? Im not going to actually use the router for anything but a share point on an existing network.

Thanks in advance for any help.