From the documentation:
When viewed at the Linux level, user shares appear under the path /mnt/user. This includes the files on the main array and also any for the share on any pool. A user share is a logical view imposed on top of the underlying physical file system so you can see the same files if you look at the physical level, as described for Disk Shares.
Note that current releases of Unraid also include the mount point /mnt/user0 that shows the files in User Shares omitting any files for a share that are on any pool. This is a different view of the files on your server. However, this mount point is now deprecated and may stop being available in a future Unraid release.
