NFSv4 acl 1

   NFSv4 ACL is same as Windows ACL. When client send attr support,  server will return all the attr they can support. if not support, will return not support flag. Don't do meaningless things.

   The NFS version 4 ACL model is quite rich.  Some server platforms may  provide access control functionality that goes beyond the UNIX-style   mode attribute, but which is not as rich as the NFS ACL model.  So   that users can take advantage of this more limited functionality, the   server may indicate that it supports ACLs as long as it follows the   guidelines for mapping between its ACL model and the NFS version 4   ACL model.

   The situation is complicated by the fact that a server may have   multiple modules that enforce ACLs.  For example, the enforcement for   NFS version 4 access may be different from the enforcement for local   access, and both may be different from the enforcement for access   through other protocols such as SMB.  So it may be useful for a   server to accept an ACL even if not all of its modules are able to   support it.   The guiding principle in all cases is that the server must not accept   ACLs that appear to make the file more secure than it really is.      

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