trying to umount the inner one:
paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 umount.nfs: /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11: device is busy paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 umount.nfs: /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11: device is busy paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 paolo@paolo:~$ sudo umount /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11 umount.nfs: /media/nas.nfs/Documents/snapshot/c_2016_11_30__00_00_11: device is busy
sometimes it says busy, sometimes it doesn't say anything, but no umount is done
trying to umount the inner one:
paolo@paolo:~$ sudo umount /media/ nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11: device is busy nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11: device is busy nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11 nas.nfs/ Documents/ snapshot/ c_2016_ 11_30__ 00_00_11: device is busy
paolo@paolo:~$ sudo umount /media/
umount.nfs: /media/
paolo@paolo:~$ sudo umount /media/
paolo@paolo:~$ sudo umount /media/
paolo@paolo:~$ sudo umount /media/
paolo@paolo:~$ sudo umount /media/
umount.nfs: /media/
paolo@paolo:~$ sudo umount /media/
paolo@paolo:~$ sudo umount /media/
umount.nfs: /media/
sometimes it says busy, sometimes it doesn't say anything, but no umount is done