Feature Request: Show btime

[Anuskuss]

Add the ability to expose the birth time (in the mounted directory):

$ mkdir enc dec && gocryptfs -init enc && gocryptfs enc dec && touch dec/file
$ stat enc/tmQgCkoEOwR6t6gIHuLfbg dec/file
  File: enc/tmQgCkoEOwR6t6gIHuLfbg
  Size: 0         	Blocks: 0          IO Block: 4096   regular empty file
Device: 0,37	Inode: 697         Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/    user)   Gid: ( 1000/    user)
Access: 2024-09-10 19:48:35.967954468 +0000
Modify: 2024-09-10 19:48:35.967954339 +0000
Change: 2024-09-10 19:48:35.966474688 +0000
 Birth: 2024-09-10 19:48:35.966474688 +0000
  File: dec/file
  Size: 0         	Blocks: 0          IO Block: 4096   regular empty file
Device: 0,59	Inode: 697         Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/    user)   Gid: ( 1000/    user)
Access: 2024-09-10 19:48:35.967954468 +0000
Modify: 2024-09-10 19:48:35.967954339 +0000
Change: 2024-09-10 19:48:35.966474688 +0000
 Birth: -