I do have lots of netapp gear and access to the now.netapp.com site. The entirity of the "zfs support" that netapp provides on their site is a single document from 2007 which is basically a reformatted zfs whitepaper showing that you can zfs format iscsi luns exported from a netapp... There isn't even a single line of netapp specific information in the entire document except for the format command output on page 5 has "NETAPP-LUN-0.2-8.01GB" as the friendly name for the disk...
As for your claim that netapp is more than a SAN/NAS, I'll agree there is a bit more in the way of features, but not much. I've yet to see a netapp used for much more than CIFS/NFS/ISCSI and maybe some light http/ftp work. Clustering, failover, remote mirroring, etc are neat but they are essentially just enterprise frosting on top of the basic nas/san functionality.