Typo, he meant disk share. If you aren't sharing disks on the network might as well just call it disks. In either case, you shouldn't mix disks and user shares when moving/copying.
In general, the user share settings only apply to new writes to the share, except the Use cache setting of course. Any read of a share will include any disks that include the folder for that share.
Another thing that happens down at the linux level that can be surprising is that if you try to move something from one user share to another, it will just get "repathed" on the same disk. This is because the linux command for move and rename are the same, mv. So, even if destination user share excludes the disk, it still winds up there. The workaround for this is to copy from source to destination, so a new file gets written according to the user share settings, then delete from the source.