Zabbix monitor samba share

Zabbix can monitor samba deamon but cant say for sure, if samba is available from network. You can monitor if samba alive with such a script. So in /etc/zabbix/external directory must be file samba_big.sh with content below.

host=1.2.3.4
rez=`nmap --host-timeout 15000  -p 445  $host | grep 445/tcp | cut -f 2 -d ' '`
if [ "$rez" != "open" ]; then
  echo "0"
else
      echo "1"
fi