weed/mount implements all four xattr operations and the filer stores the
values, but the Windows adapter overrode none of them, so cgofuse's
defaults answered every call with 'not implemented'. WinFsp advertises
extended attribute support either way, because cgofuse registers the
callbacks unconditionally, so applications were told the volume has them
and then refused on every use. Attributes written from Linux were
invisible from Windows.
Untested in CI: exercising Windows extended attributes needs the native
NtSetEaFile path rather than anything in os or PowerShell.
Chris LuandGitHub
a0e278f86f