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A comment on Mkfile(8) is severely syscall limited on OS X. Parent comment

Re:Mkfile(8) is severely syscall limited on OS X by justincormack on Sunday February 12, 2017 @08:21AM (#13628201)
OSX doesn't support sparse files...
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Re:Mkfile(8) is severely syscall limited on OS X by parasubvert on Sunday February 12, 2017 @09:45AM (#13628534)
It does, just not at the HFS+ layer. Sparse bundles are the functional equivalent at the Vitual file system layer and are used by Time Machine and are useable by developers or via the CLI. Sparse images are entire virtual volumes and are used for FileVault.

https://en.m.wikipedia.org/wiki/Sparse_image

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Re:Mkfile(8) is severely syscall limited on OS X by Wevah on Sunday February 12, 2017 @05:56PM (#13631609)
To clarify: FileVault on 10.6 and earlier; current FileVault is FDE.
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Re:Mkfile(8) is severely syscall limited on OS X by id_kc on Sunday February 12, 2017 @10:02AM (#13628615)
>just not at the HFS+ layer

macOS supports sparse bundle with HFS+

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Re:Mkfile(8) is severely syscall limited on OS X by parasubvert on Sunday February 12, 2017 @10:11AM (#13628657)
As I was saying, that's implemented above HFS+
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