Wrong ttl calculation due to getting 0 createtime

[coderwf]

Alluxio Version:
2.9.6

Describe the bug
LocalCacheManager will invalidate cache(a Page) if expiration time reached，so a ttl of file will be calculated by currentTimeMS - creationTimeMS.
This is the way used to get createTime of one file: (FileTime) Files.getAttribute(path, "creationTime"); but some file system like ext4 or so dot not support the attribute 'creationTime' so a zero value will be got,

To Reproduce
a filesystem like juice-fs doesnt support birthtime

Expected behavior
if a zero createTime got, use a lastest modified time intead?

Urgency
P0

Are you planning to fix it
my pleasure

Additional context
no more