NTFS Permissions - Remove group from top parent folder which got inherited

I have a group which is granted NTFS permissions on top Level of a shared folder.  The shared folder is used for homedrives.

I need to get rid of the complete group, how should I do this?  I need to delete the group in AD and remove all the permissions which is granted to the group.  Please see attached screenshots.  I am talking about the group NSMProxyRights.

thanks
SU-Permissions1.jpg
SU-Permissions2.jpg
whenzAsked:
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A KarelinCommented:
Delete this group on Share tab and Security tab and then in AD.
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whenzAuthor Commented:
But what happens to child folders?  Are the permissions overwritten again from the parent folder once I remove the group?  

How about this plan?:
 1. write a powershell script which disables inheritance and leaves the permissions incl inherited permissions as they are.
 2. remove the group from the ntfs permissions using a powershell script.
 3. enable inheritance again.
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A KarelinCommented:
If inheritance is OK permissions will deleted correctly from top folder to child folders and files.
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David Johnson, CD, MVPOwnerCommented:
that or it will be orphaned  and since the SID doesn't translate to any account it is effectively useless.
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