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...) setxattr("/usr/local/samba/tmpE7Z_yH", "security.NTACL", "\1\0\1\0\0\0\2\0\1\0\0\200\34\0\0\0(\0\0\0\0\0 \0\0\0\0\0\0\1\1\0\0\0\0\0\5 \0\0\0\1\1\0\0\0\0\0\5 \0\0", 52, 0) = -1 EPERM (Operation not permitted) write(2, "You are not root or your system "..., 89You are not root or your system do not support xattr, using tdb backend for attributes. ) = 89 close(3) = 0 unlink("/usr/local/samba/tmpE7Z_yH") = 0 write(2, "not using extended attributes to"..., 171not using extended attributes to store ACLs and...

I am trying to install samba 4.5.1 from source, as a domain controller only, under Ubuntu 16.04, with ZFS filesystem (actually inside an lxd container with ZFS backing). Out-of-the-box, samba-tool domain provision does not like the filesystem: ERROR(<class 'samba.provision.ProvisioningError'>): Provision failed - ProvisioningError: Your filesystem or build does not support posix