Return ENAMETOOLONG if file names are too long

[overheadhunter]

Due to cryptomator/cryptofs#77, we need to pass through "file name too long" errors thrown by the underlying file system.

Example thrown by underlying ecryptfs on Linux:

java.nio.file.FileSystemException: path/of/long/file.txt: File name too long
    at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:100)
    at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)

Besides operations creating nodes (such as mkdir or symlink) we noticed that error code ENAMETOOLONG is also expected to be returned by getattr.