Shared folder still accessible for the non-domain registered client computers

I shared folders in my server with specific access/permission to a certain group (i.e accounting or sales) but for the client computers that aren't registered to the domain still can access the folders by going to the Run command and key-in the server IP like \\  is there any way that I can stop that or block non-registered client computers to have access?
Thanks guys!

P.S .
I am using Windows Server 2012 R2
Jeff BalbalosaSystem Analyst/ProgrammerAsked:
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yo_beeDirector of Information TechnologyCommented:
If your share permissions and security is set correctly for your domain access then all non-domain users should not be able to easily access the shares without knowing a domain user credentials even if they know the server IP.  If a computer is on the same network (subnet) there is nothing stopping them from navigating to the server.  

Do you have the Everyone group with rights to the folder share on this server?
Seems like it is.
Mitul PrajapatiIT SupervisorCommented:
Yo_bee is right.

There are 2 possibilities in here.

(1) User knows the domain user credential   or
(2) You can remove everyone from folder share. (This will not work if the user has the domain user credential)
Shaun VermaakTechnical Specialist IVCommented:
You can block non-domain computers with the Windows Firewall

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Jeff BalbalosaSystem Analyst/ProgrammerAuthor Commented:
Very informative guys surely I will try your suggestions. appreciated!
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