Separating users so they do not see each others's directories in FreeBSD

[Charles Hatvany]

Hi,

Sorry to ask such a simple question, but I need to separate several
users, so they cannot even see each other's directories.  All will have
significant data on the same server in different directory trees.  What
is the easiest way to accomplish this?  Jails seem like a lot of work,
but if that is the only way...

Thanks in advance.

Charles Hatvany