ZFS mountpoint property

Hi managers

I have ZFS question.
I change ZFS mountpoint property.

for exanple
zfs set mountpoint=/mnt tank/home

I want to rechange mountpoint property default value "inherited" .
but I get error like follow:

# zfs set mountpoint=default tank/home
bad mountpoint value 'default': must be an absolute path, 'none', or
'legacy'
#

How do I set default value?
Please Tell Me.

thanks

hiro

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