Refactor filesystem to not be dependent on a server struct

server/filesystem/stat_linux.go

@@ -0,0 +1,13 @@
+package filesystem
+
+import (
+	"syscall"
+	"time"
+)
+
+// Returns the time that the file/folder was created.
+func (s *Stat) CTime() time.Time {
+	st := s.Info.Sys().(*syscall.Stat_t)
+
+	return time.Unix(st.Ctim.Sec, st.Ctim.Nsec)
+}