NFS

since the NFS sharing is now a part of ZFS, you will also have to set the share options on the filesystem:

# zfs create rpool/export/downloads
# zfs set share=zfs set share=name=downloads,path=/downloads,prot=nfs,anon=0 rpool/export/downloads
name=downloads,path=/downloads,prot=nfs,anon=0
# zfs set sharenfs=on rpool/export/downloads
# share
downloads       /downloads      nfs     anon=0,sec=sys,rw
------remove-------
# zfs get share rpool/export/downloads
NAME                    PROPERTY  VALUE  SOURCE
rpool/export/downloads  share     name=downloads,path=/downloads,prot=nfs,anon=0  local
rpool/export/downloads  share.nfs  on     local
# zfs set sharenfs=off pool/export/downloads
# zfs set -c share=name=downloads rpool/export/downloads
share 'downloads' was removed.
# share
# zfs get share,sharenfs rpool/export/downloads
NAME                    PROPERTY   VALUE  SOURCE
rpool/export/downloads  share.nfs  off    local
#

Setting up the Server Version

# svcprop svc:/network/nfs/server:default|grep versm
nfs-props/server_versmax integer 4
nfs-props/server_versmin integer 2
# sharectl set -p server_versmax=3 nfs
# sharectl set -p server_versmin=3 nfs
# sharectl set -p client_versmax=3 nfs
# sharectl set -p client_versmin=3 nfs
# svcadm refresh svc:/network/nfs/server:default
# svcprop svc:/network/nfs/server:default|grep versm
nfs-props/server_versmin integer 3
nfs-props/server_versmax integer 3
#
<client># cd /net/192.168.56.10/downloads
<client># nfsstat -m `pwd`
/net/192.168.56.10/downloads from 192.168.56.10:/downloads
 Flags:         vers=3,proto=tcp,sec=sys,hard,intr,link,symlink,acl,rsize=32768,wsize=32768,retrans=5,timeo=600
 Attr cache:    acregmin=3,acregmax=60,acdirmin=30,acdirmax=60

NFS@11.1+

With Solaris 11.1 the NFS share syntax and property names were changed.

# zfs create -o mountpoint=/sharetest \
> -o share.nfs=on \
> -o share.nfs.anon=0 \
> -o share.auto=on \
> data/sharetest
# share
IPC$            smb     -       Remote IPC
data_sharetest  /sharetest      nfs     anon=0,sec=sys,rw