[PATCH][SMB3] do not try to cache root directory if dir leases not supported

[Steve French]

To servers which do not support directory leases (e.g. Samba)
    it is wasteful to try to open_shroot (ie attempt to cache the
    root directory handle).  Skip attempt to open_shroot when
    server does not indicate support for directory leases.

    Cuts the number of requests on mount from 17 to 15, and
    cuts the number of requests on stat of the root directory
    from 4 to 3.

(also added cc: stable v5.1+)



-- 
Thanks,

Steve
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