How to use setfacl on ZFS dataset to set the equivalent of UNIX-style chmod 770?

Note: the following is from a Solaris system, but the results should also work on BSD (where you need to use getfacl/setfacl instead of ls/chmod).

The default permissions of a newly created (text) file are:

   owner@:rw-p--aARWcCos:-------:allow
   group@:r-----a-R-c--s:-------:allow
everyone@:r-----a-R-c--s:-------:allow

If you use chmod 0770 /path/to/file, you will get:

   owner@:rwxp--aARWcCos:-------:allow
   group@:rwxp--a-R-c--s:-------:allow
everyone@:------a-R-c--s:-------:allow

Essentially, execute (x) is added for owner and group, read (r) is removed from everyone, and write (w) and append (p) are added to group.

For a directory, it looks as follows:

   owner@:rwxp-DaARWcCos:-------:allow
   group@:r-x---a-R-c--s:-------:allow
everyone@:r-x---a-R-c--s:-------:allow

And after modification:

   owner@:rwxp-DaARWcCos:-------:allow
   group@:rwxp-Da-R-c--s:-------:allow
everyone@:------a-R-c--s:-------:allow

Here, read (r) and execute (x) are removed from everyone, while owner and group have the same permissions as in the file case, although with added delete_child (D) permission (this comes from being a directory).