Exposed PC Admin Shares Security in Windows & Samba Network

We have an issue where Linux/Mac clients can browse Windows 7 client admin shares (admin$ & c$) using samba/SMB.  The Linux/Mac clients are authenticating using a domain user account and can open/modify any file.  Domain users are NOT listed as admin users in the local computer administrators group.

I suspect this is an issue with a local security policy, as it is affecting clients only and not servers.  Anyone have any idea what I may have set incorrectly in our local security policies?  Nothing stands out as being configured incorrectly.
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Normally, people who ask this are finding out some time that these users were admins or that cached credentials of an admin account were used. Never was it a misconfiguration or "OS weirdness", so I don't advise to follow that road.

Look at the admin group once more, look at nested groups.

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Natty GregIn Theory (IT)Commented:
Set password and permissions on the share also set a time out policy through group policy object to time out after period of
inactivity. then gpupdate/f
tcloudAuthor Commented:
Looking once more helped -- How did that get in there!?!?!
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Windows 7

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