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The xstat function never got merged into mainline. However, a new statx call was proposed later on, and was merged in Linux 4.11. The new statx(2) system call does include a creation time in its return struct. However, glibc added a wrapper for statx(2) only in 2.28 (release August 2018). And support for using this wrapper was added in GNU coreutils in 2.31 (released March 2019):

The xstat function never got merged into mainline. However, a new statx call was proposed later on, and was merged in Linux 4.11. The new statx(2) system call does include a creation time in its return struct. A wrapper for statx(2) was added to glibc only in 2.28 (release August 2018). And support for using this wrapper was added in GNU coreutils 8.31 (released March 2019):

% stat --version
stat (GNU coreutils) 8.31
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Michael Meskes.
% stat /
  File: /
  Size: 4096            Blocks: 8          IO Block: 4096   directory
Device: b302h/45826d    Inode: 2           Links: 17
Access: (0755/drwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2019-06-06 20:03:12.898725626 +0900
Modify: 2019-05-28 05:15:44.452651395 +0900
Change: 2019-05-28 05:15:44.452651395 +0900
 Birth: 2018-06-07 20:35:54.000000000 +0900