## Type: SB-POSIX:FILENAME
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> A STRING designating a filename in native namestring syntax.
> 
> Note that native namestring syntax is distinct from Lisp namestring syntax:
> 
> (pathname "/foo*/bar")
> 
> is a wild pathname with a pattern-matching directory component.
> SB-EXT:PARSE-NATIVE-NAMESTRING may be used to construct Lisp pathnames that
> denote POSIX filenames as understood by system calls, and
> SB-EXT:NATIVE-NAMESTRING can be used to coerce them into strings in the native
> namestring syntax.
> 
> Note also that POSIX filename syntax does not distinguish the names of files
> from the names of directories: in order to parse the name of a directory in
> POSIX filename syntax into a pathname MY-DEFAULTS for which
> 
> (merge-pathnames (make-pathname :name "FOO" :case :common)
> my-defaults)
> 
> returns a pathname that denotes a file in the directory, supply a true
> :AS-DIRECTORY argument to SB-EXT:PARSE-NATIVE-NAMESTRING. Likewise, to supply
> the name of a directory to a POSIX function in non-directory syntax, supply a
> true :AS-FILE argument to SB-EXT:NATIVE-NAMESTRING.