Issues sharing folder through NFS - RPC: Unable to send; errno = Bad file descriptor or Program not registered
Apparently, I had some issues with my /etc/hosts file. The suspicion was alert seeing rpc.lockd[215] : can't contact statd, 100024 RPC: Timed out all over.

I cleaned up the /etc/hosts file: 


##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost


Restarted the service
sudo nfsd restart

And finally when doing showmount -e localhost:

Exports list on localhost:
/Users/kiwi/user/shared-test         Everyone


rpcinfo -p


   program vers proto   port
    100000    2   udp    111  rpcbind
    100000    3   udp    111  rpcbind
    100000    4   udp    111  rpcbind
    100000    2   tcp    111  rpcbind
    100000    3   tcp    111  rpcbind
    100000    4   tcp    111  rpcbind
    100024    1   udp    906  status
    100024    1   tcp   1021  status
    100021    0   udp    730  nlockmgr
    100021    1   udp    730  nlockmgr
    100021    3   udp    730  nlockmgr
    100021    4   udp    730  nlockmgr
    100021    0   tcp   1017  nlockmgr
    100021    1   tcp   1017  nlockmgr
    100021    3   tcp   1017  nlockmgr
    100021    4   tcp   1017  nlockmgr
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100005    1   udp    989  mountd
    100005    3   udp    989  mountd
    100005    1   tcp   1023  mountd
    100005    3   tcp   1023  mountd
    100011    1   udp    636  rquotad
    100011    2   udp    636  rquotad
    100011    1   tcp    999  rquotad
    100011    2   tcp    999  rquotad