8
automatic bind mount/unmount
(discuss.tchncs.de)
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On KDE, you can just tick the checkbox.
Thunar file manager has volman. You can use it to manually unmount, including binds, but I'm not sure how to trigger it to know about them automatically. It's an extra step because it has to read the rest of the fstab file to find any dependencies and I don't know why it would do that.
I updated the OP to show my fstab