add an option for comparison where hard links data is not compared several...
For full, incremental, compressed and encrypted backups or archives
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no need of option, but add a mapping while comparing, to associate the inode etiquette to
{ dev_id, inode_id, path of the first link found for that inode } .
at second and next occurence, if dev_id/inode_id we compare to is the same as the one found in the mapping, we are good, this is the same inode, else we fallback to data comparison
see filesystem_hard_link_read probably better to extend existing code to also support comparison operation. (see if possible to reuse/share code of filesystem_hard_link_read class)