ZFS How to recursively send snapshots without copying the old snapshots

I have a system with Freebsd. I have created many file systems. The challenge is to make a backup on another server. I read that it is possible to recursively create snapshots.
zfs snapshot -r zroot@date
I have received a lot of snapshots for different file systems, and rightly so.
Then I found that I can send all recursively.
zfs send -R zroot@date
Is great, but in backpool I saw that was copied from old snapshots. How can I recursively copy a filesystem without old snapshots?