filefrag: add page (#4487)

pages/linux/filefrag.md

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+# filefrag
+
+> Report how badly fragmented a particular file might be.
+> More information: <https://linux.die.net/man/8/filefrag>.
+
+- Display a report for a specific file:
+
+`filefrag {{path/to/file}}`
+
+- Display a report for space-separated list of files:
+
+`filefrag {{path/to/file1}} {{path/to/file2}}`
+
+- Display a report using a 1024 byte blocksize:
+
+`filefrag -b {{path/to/file}}`
+
+- Sync the file before requesting the mapping:
+
+`filefrag -s {{path/to/files}}`
+
+- Display mapping of extended attributes:
+
+`filefrag -x {{path/to/files}}`
+
+- Display a report with verbose information:
+
+`filefrag -v {{path/to/files}}`