Macos: zprop documentation

Add a new manpage that describes the zprops used on macos
Signed-off-by: Andrew Innes <andrew.c12@gmail.com>
Co-Authored-By: Jorgen Lundman <lundman@lundman.net>

man/Makefile.am

@@ -21,6 +21,7 @@ dist_man_MANS = \
 	%D%/man7/zpool-features.7 \
 	%D%/man7/zpoolconcepts.7 \
 	%D%/man7/zpoolprops.7 \
+	%D%/man7/zfsprops-macos.7 \
 	\
 	%D%/man8/fsck.zfs.8 \
 	%D%/man8/mount.zfs.8 \

man/man7/zfsprops-macos.7

@@ -0,0 +1,95 @@
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+.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
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+.\" Copyright (c) 2011, Pawel Jakub Dawidek <pjd@FreeBSD.org>
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+.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
+.\" Copyright (c) 2014 by Adam Stevko. All rights reserved.
+.\" Copyright (c) 2014 Integros [integros.com]
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+.\" Copyright (c) 2014, Xin LI <delphij@FreeBSD.org>
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+.\"
+.Dd April 29, 2021
+.Dt ZFSPROPS-MACOS 7
+.Os
+.
+.Sh NAME
+.Nm zfsprops-macos
+.Nd native properties of ZFS datasets specific to macOS
+.
+.Sh DESCRIPTION
+These properties are like the native properties described in
+.Xr zfsprops 7
+but they are specific to macOS.
+.Pp
+The following native properties can be used to change the behavior of a ZFS
+dataset.
+.Bl -tag -width ""
+.It Xo
+.Sy browse Ns = Ns Sy on Ns | Ns Sy off
+.Xc
+Equivalent to mount option
+.Sy browse/nobrowse .
+This option indicates
+that the mount point should not be visible via the GUI (i.e., appear
+on the Desktop as a separate volume).  Setting it to off will result
+in Spotlight being unavailable for the specified mount point.
+The default value is
+.Sy off .
+.It Xo
+.Sy ignoreowner Ns = Ns Sy on Ns | Ns Sy off
+.Xc
+Equivalent to mount option
+.Sy noowners .
+Ignore the ownership field for the entire volume.
+The default value is
+.Sy off .
+.It Xo
+.Sy mimic Ns = Ns Sy hfs Ns | Ns Sy off
+.Xc
+Some applications check if the filesystem type is "hfs" and refuse to work with
+ZFS.
+In this situation, this property can be enabled and the filesystem type will be
+reported as "hfs".
+The default value is
+.Sy off .
+.It Xo
+.Sy devdisk Ns = Ns Sy poolonly Ns | Ns Sy on Ns | Ns Sy off
+.Xc
+Create a /dev/diskX pseudo-disk for the mount, which has better compatibility
+with macOS UI.
+Due to the cost of creating a /dev/disk entry, the default value is set to
+.Sy poolonly
+as to only create an entry for the pool's root dataset.
+For lower datasets, set to
+.Sy on .
+.El