$simul_inode_array
$simul_inode_array :
Computes a string uniquely identifying a given path on this host.
Mount point unicity is based on a combination of device+inode+mtime.
On systems which don't supply a valid inode number (eg Windows), we maintain a fake inode table, whose unicity is based on the path filtered through realpath(). It is not perfect because I am not sure that realpath really returns a unique 'canonical' path, but this is best solution I have found so far.