add findmnt.md

linux/findmnt.md

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+# findmnt
+
+> Find your filesystem
+
+- List all mounted filesystems
+
+`findmnt`
+
+- Search for a device
+
+`findmnt {{/dev/sdb1}}`
+
+- Search for a mountpoint
+
+`findmnt {{/}}`
+
+- Find filesystems in specific type
+
+`findmnt -t {{ext4}}`
+
+- Find filesystems with specific label
+
+`findmnt LABEL={{BigStorage}}`