/lib/partman/mountoptions/btrfs is in ubiquity 2.21.63.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | noatime
nodiratime
relatime
nodev
nosuid
noexec
ro
sync
usrquota
grpquota
nodatasum
nodatacow
nobarrier
compress
ssd
noacl
notreelog
flushoncommit
discard
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