substfs -D -D -m q -s subone -n tcp!one!9fs edit-from edit-to  >/dev/null >[2=1] &
substfs -D -D -m q -s subtwo -n tcp!two!9fs edit-from edit-to  >/dev/null >[2=1] &



another example of usage:
(where one and two could be unix machines running u9fs)

substfs -m q -s subone -n tcp!one!9fs edit-from edit-to  >/dev/null >[2=1] &
substfs -m q -s subtwo -n tcp!two!9fs edit-from edit-to  >/dev/null >[2=1] &
mount /srv/subone /n/one
mount /srv/subtwo /n/two