Filesystems in NetBSD

[sergei karhof <karhof21%gmail.com@localhost>]

Hi, I am new to NetBSD, so forgive me if this question has been asked
many times.

Which are the better supported filesystems in NetBSD, and what is
their current status (practical usability)? I am especially interested
in filesystems like BtrFS and ZFS. In case these two are not yet
supported, what NetBSD-supported filesystem comes closest to them?

Thanks

Serg