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The samba backend calls stat for each file during the enumeration job.
Unfortunately, this is significantly slower with the recent samba versions.
However, smbc_readdirplus2() has been recently added and it can be used
to improve the performance as all the necessary info is transferred in one
network request. Let's use smbc_readdirplus2() if available.

See: https://gitlab.com/samba-team/samba/merge_requests/302

Relates: #306