cap mask differences for `Client::stat` vs `Client::fstat`

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In the libcephfs client it looks like both `Client::stat` and
`Client::lstat` use a default mask of CEPH_STAT_CAP_INODE_ALL and are
able to return immediately from `Client::_getattr` without making an
MDS request. However, `Client::fstat` uses hard-coded -1 as the cap
mask and always issues a MDS request. Is this the intended behavior,
and if so, what are different semantics of fstat that make this a
requirement?

Thanks,
Noah
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