Thank You All for your posts.

I've just solved my problem like this:

smb.conf:
[global]
netbios name = ROUTER
server string = ROUTER
security = USER
encrypt passwords = Yes
hosts allow = 172.16.0.
workgroup = WORKGROUP
log file = /opt/var/log/samba/log.%m
max log size = 100
dns proxy = No
read only = No
smb password file = /opt/etc/samba/smbpasswd
[share]
comment = Data share
path = /tmp/harddisk/data

... and finally I've added password for my user into smbpasswd (with "smbpasswd" utility)

This works on my NB that is in company domain and on my home PC as well.
Of course, I had to login for first time I access share folder (as router_user with password from smbpasswd)

So this is my solution, maybe it is not ideal, but it works