systemd-umount (1)   - Establish and destroy transient mount or auto-mount po...
umount (2)           - unmount filesystem
umount (8)           - unmount filesystems
umount.nfs (8)       - unmount a Network File System
umount.nilfs2 (8)    - unmount NILFS2 file systems
umount.udisks2 (8)   - unmount file systems that have been mounted by UDisks2
umount2 (2)          - unmount filesystem