Hi okonita,
first, this is clearly a Linux/Unix issue and is not related to DB2. Therefore I'll suggest this thread to be moved to another forum.
Nevertheless, I'll try to answer your question and make things clear.
The mount command doesn't show /sbin because it's no mount point. I'll show you an example (and try to be better at ascii art than Picasso):
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list of mount points:
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/dev/sda1 /boot
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/dev/sda3 /
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/dev/sdb1 /home
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/ (this is the <root> directory = /dev/sda3)
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+ bin (simple directory)
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+ boot (mountpoint of /dev/sda1)
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+ home (mountpoint of /dev/sdb1)
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| + john
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| + peter
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| + mary
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+ sbin (simple directory)
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There could also be a directory /home/john/deep/down/the/filesystem which is the mountpoint for some remote nfs service.
Furthermore, your list of mountpoint is rather unusual - they don't seem to be system related but are all placed in the root (top) directory. More common is to gather them in a directory on second level.
Regards,
Bernd