Aha, it's an NFS server option. Thanks!
nfs server show -fields v3-hide-snapshot
Michael
From: "Parisi, Justin" <Justin.Parisi@netapp.com>
Date: Wednesday, August 4, 2021 at 6:24 PM
To: "toasters@teaparty.net" <toasters@teaparty.net>, "Fenn, Michael" <Michael.Fenn@DEShawResearch.com>
Subject: Re: Removing .snapshot from directory listings?
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Check out TR-4067
https://www.netapp.com/media/10720-tr-4067.pdf - page 97
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From: Toasters <toasters-bounces@teaparty.net> on behalf of Fenn, Michael <Michael.Fenn@DEShawResearch.com>
Sent: Wednesday, August 4, 2021 5:58:58 PM
To: toasters@teaparty.net <toasters@teaparty.net>
Subject: Removing .snapshot from directory listings?
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Does anyone know if there's a way to hide .snapshot in directory listings, but have it still be accessible if you know the name? This is how .zfs/snapshot works, and it's an (IMHO) elegant way to make snapshots accessible without having a naïve find, du, etc. at the root of the filesystem descend into deep snapshot hierarchies.
Note that I do see the snapdir-access field on volumes, but setting that to false seems to block access to .snapshot completely, which isn't what I want.
Thanks,
Michael